so 21 - 13, the money will be invested for 8 years.

It also belongs to set of natural numbers.
Answer:
1 foot and 6 inches
Step-by-step explanation:
12 feet (144 inches) - 10 feet and 6 inches (126 inches) = 1 foot and 6 inches (18 inches)
Step-by-step explanation:
4x² - 12x + 17 = 0
i is an imaginary number and it equals √-1, and you usually put it when the number under the root is negative.
So √-5 = √5i and √-4 = 2i
The answers to the question is A.